(昆明理工大學 冶金與能源工程學院，昆明 650093)
摘 要: 濕法煉鋅過程中產(chǎn)生的窯渣含有大量的有價金屬。鋅冶煉污酸具有成分復(fù)雜、酸度高、含有大量的砷及其他重金屬離子的特點。根據(jù)鋅窯渣和污酸的理化性質(zhì)，將二者進行聯(lián)合浸出處理，考察反應(yīng)時間、反應(yīng)溫度、液固比、H2O2加入量、窯渣粒徑對鋅窯渣與污酸聯(lián)合浸出行為的影響。結(jié)果表明：在反應(yīng)時間3 h、反應(yīng)溫度50 ℃、液固比(mL/g) 10:1、H2O2加入量為16 mL、窯渣粒徑75~106 μm條件下進行二段逆流浸出，銅、鐵、鋅的浸出率均高于90%。浸出后液的酸度從172.48 g/L降至20 g/L左右，砷濃度達9 g/L左右，為后續(xù)沉砷處理提供了條件。另外，對浸出渣進行分析，可知浸出渣中主要物相為CaSO4？2H2O、SiO2和焦炭，其中銀品位最高達484.7 g/t，可作為提銀原料。
關(guān)鍵字: 鋅窯渣；污酸；聯(lián)合浸出；濕法煉鋅
（Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:Large amount of valuable metals are contained in kiln slag produced in zinc hydrometallurgy. The waste acid in zinc metallurgy has the characteristics of complex composition, high acidity and large amount of arsenic and other heavy metal ions. The zinc kiln slag and waste acid were leached combined according to the physical and chemical properties. The effect of the combined leaching behavior on kiln slag and waste acid was investigated by the conditions, including reaction time, reaction temperature, solid-liquid ratio, the addition of H2O2, and particle size of kiln slag. The experimental results show that after the two stages reflux leaching, the leaching rates of copper, iron, zinc are higher than 90% for 50 g kiln slag, 3 h reaction time, 50 ℃ reaction temperature, 10:1 mL/g liquid-solid ratio, 16 mL H2O2, 75-106 μm kiln slag particle size, respectively. The acidity of leach solution decreases from 172.48 g/L to about 20 g/L and the arsenic concentration reaches about 9 g/L, which provide conditions for subsequent arsenic treatment. The main phases of residue are CaSO4？2H2O, SiO2 and coke according to the analysis of leaching residue. The silver grade is up to 484.7 g/t, which can be used as raw material for extracting silver.
Key words: zinc kiln slag; waste acid; combined leaching; zinc hydrometallurgy
